His porn career — and flattish stomach — may be long gone, but smut king Ron Jeremy has apparently not gotten sex out of his system.

Later this month Jeremy opens Club Sesso in downtown Portland, OR — the city’s fanciest, members-only Swingers Club.

It’s an odd fit for this crunchy town known more for its burgeoing foodie scene rather than penchant for three/four/five-somes.

Jeremy (above, in chest hair) — who has also dabbled in numerous reality TV shows — is partnering with a local club owner and hopes to make Sesso a nationwide chain.

This will be Jeremy’s first “brick-and-mortar” biz.

Perhaps he’s taking inspiration from Ballys Fitness — convenietly located just across the street from Sesso for early morning/post-coital workouts.